Dr. Ing. H.c. F. Porsche Aktiengesellschaft

Axel Richter

Patric Lardy

Ulrich Eger

Ulrich Schempp

Herbert Glueck

Jochen Lorenz

An arrangement for the recognition of misfirings of internal combustion engines with externally supplied ignition in which for the recognition of misfirings, the cylinders are combined into two groups and an ignition system of its own is coordinated to each group; a thermo-element is thereby arranged in the exhaust tract of a cylinder of each group. A pair of thermo-elements is series-connected in opposite polarity and the resulting thermo-voltage at the free ends is monitored by means of two threshold circuits. From the amount and sign of the resulting thermo-voltage, a defective ignition system can be determined and the corresponding cylinder group can be turned off.

Arrangement for recognizing misfirings in internal combustion engines

An arrangement, for adapting the serial interface of a data processing system to the data speed of a communication partner, has a recognition circuit for recognizing the transmission speed wherein signals from the communication partner having the unknown transmission speed are inputted to a frequency counter of the recognition circuit and the resulting count provided to a microprocessor which calculates an adjustment division signal N from the counting results. The adjustment divison signal N is inputted to a frequency divider of a phase lock loop (PLL) circuit of an adjustment circuit to provide a divided clock frequency signal which is compared with a divided reference frequency signal by the PPL circuit so that the frequency of a voltage control oscillator of the PLL circuit is adjusted until the divided clock frequency signal and divided reference frequency signal are equal. The adjusted voltage control oscillator signal is inputted to the microprocessor from which a matching data transmission speed equal to the data transmission speed of the communication partner is calculated.

Arrangement for the individual adaptation of a serial interface of a

A multi-cylinder internal combustion engine with two exhaust gas turbochargers of which one is adapted to be switched-in during the operation of the internal combustion engine by way of a switch-in valve controllable on the turbine side and by way of a check valve on the compressor side. Furthermore, a controllable blow-off valve (waste gate) is installed into a by-pass line which by-passes both turbines. The blow-off valve and the switch-in valve are controllable by a control apparatus as a function of condition magnitude of the internal combustion engine. The activation of the blow-off valve and of the switch-in valve is subjected to an anticipatory control dependent on condition magnitudes on which at least one charging-pressure-dependent regulation is superimposed. The regulation has advantageously a PID-like structure whereby the regulating parameters are condition-dependent. The regulation and control are additionally subjected to static as well as dynamic limitations. A noticeable improvement of the power output, respectively, torque behavior of the internal combustion engine results from the deliberate control and regulation of the charging system.

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Wimsheim, Germany

Axel Richter